Definition: In this task, you are given an input list A. You need to convert all the alphabets in the list with a number representing their position in the English alphabet. E.g., replace A by 1, B by 2, a by 1, b by 2, and so on.
Input: ['9745', '8525', '5645', 'P', 'C', 'I', 'a']

9745, 8525, 5645, 16, 3, 9, 1